M365 pill – Identify drug class, imprint, dosage, color, size, shape, side effects

What is M365 white pill?

M365 is an imprint on a pill identified as white in a capsule shape. The pill is a combination of two active ingredients acetaminophen in the dose of 325 mg and hydrocodone bitartrate in the dose of 5 mg. It is used to relieve moderate to severe pain. M365 pill contains an opioid (narcotic) pain reliever hydrocodone and a non-opioid pain reliever acetaminophen. Acetaminophen is less potent pain reliever added in this combination to increase hydrocodone effects. It is supplied by Mallinckrodt Pharmaceuticals.

What type of pill is m365?
What is m365 pill used for?
  • Imprint: M365
  • Strength: 325 mg / 5 mg
  • Color: White
  • Size: 15.00 mm
  • Shape: Capsule-shape
  • Availability: Prescription only
  • Drug Class: Narcotic analgesic combinations
  • Pregnancy Category: C – Risk cannot be ruled out
  • CSA Schedule: Schedule 2 – High potential for abuse
  • Labeler / Supplier: Mallinckrodt Pharmaceuticals
  • Inactive Ingredients: crospovidone, magnesium stearate, microcrystalline cellulose, povidone, corn starch, silicon dioxide, stearic acid

What are labelers/repackagers of M365 pill?

Different labelers/repackagers of M365 pill with their NDC codes are:

  • 00406-0123 Mallinckrodt Inc. (labeler)
  • 52959-0737  H.J. Harkins Company, Inc. (repackager)
  • 63874-1092  Altura Pharmaceuticals Inc. (repackager)
  • 68071-0296  Nucare Pharmaceuticals Inc. (repackager)

Active ingredients of M365 pill and identification

Two active ingredients of M365 pill are hydrocodone bitartrate and acetaminophen (paracetamol)

Hydrocodone belongs to the pharmacological class of opioid analgesic and occurs as fine, white crystals or as a crystalline powder.

Acetaminophen or paracetamol pharmacologically categorized as a non-opiate, non-salicylate analgesic and antipyretic. It occurs as a white, odorless, slightly bitter crystalline powder.

M365 pill chemistry

M365 pill is a combination of two active ingredients: acetaminophen and hydrocodone.


IUPAC name: N-(4-hydroxyphenyl)ethanamide

Molecular formula: C8H9NO2

Molecular weight: 151.163 g/mol

Molecular structure:

M365 pill chemistry

Drug class: Acetaminophen belongs to the organic class of compounds known as 1-hydroxy-2-unsubstituted benzenoids, which are phenols unsubstituted at the 2-position.


IUPAC name: 4,5α-epoxy-3-methoxy-17-methylmorphinan-6-one

Molecular formula: C18H21NO3

Molecular weight: 299.368 g/mol

Molecular structure:

Hydrocodone: molecular structure

Drug class: Hydrocodone belongs to the organic class of compounds named morphinans which are polycyclic compounds with a four-ring skeleton with three condensed six-member rings forming a partially hydrogenated phenanthrene moiety, one of which is aromatic while the two others are alicyclic.

M365 white pill uses

M365 pill is used in the treatment of moderate to severe pain including back pain, severe pain and rheumatoid arthritis. It is also used for the symptomatic relief of nonproductive cough, alone or in combination with other antitussives or expectorants.

M365 Pill Images (White / Capsule-shape)

FDA approved indications are:

  • Severe Pain
  • Moderate Pain

M365 white pill legal status

Acetaminophen/hydrocodone 500 mg/5 mg is categorized as a Schedule 2 controlled substance under the Controlled Substance Act (CSA). This means that this drug has a high potential for abuse. Abuse of the drug may lead to severe psychological or physical dependence.

M365 white pill side effects

Acetaminophen/hydrocodone may cause following side effects:

Common side effects:

  • Drowsiness
  • Dizziness
  • Nausea, vomiting
  • Constipation

Serious side effects:

  • Difficulty with breathing, allergy, and swelling of the face, lips, tongue or hives
  • Decreased breathing, bradycardia
  • Lightheadedness
  • Convulsions
  • Feeling anxious, fearful, or depressed; mood swings
  • Confusion, unusual thoughts
  • Difficulty urinating
  • Upper abdominal pain, itching, little appetite, dark urine, clay-colored stools, jaundice
  • Skin redness or rash that causes blistering

How long M365 white pill stays in the system?

Most users should have cleared the M365 pill from their system within 1 day, but may not clear its metabolite norhydrocodone for up to 2 days.

M367 pill – Identify drug class, imprint, dosage, color, size, shape, side effects